KR910003813B1 - Regular power supply - Google Patents

Abstract

The circuit for receiving two kinds of different input voltage provides constant power to the electric blanket. The circuit comprises a SCR, a heating coil (11) having the equivalent capacitance (15), a volume (VR) for temperature setting, a pair of resistors (R1-2) which resistances are different, each other, a bidirectional thyristor (SSS) driving a relay (Ry), and a bridge rectifier (20). According to the input voltage, the bidirectional thyristor is turned on/off to drive the relay, and one of the resistors is selected to adjust the trigger time of the SCR so that the constant power is supplied regardless of the input voltage.

Description

Static power supply of electric field or electric charge

1 is a circuit diagram of a power supply apparatus in a conventional electric field plate or an electric yaw.

2A is a schematic perspective view of a heating element embedded in an electric field plate.

(B) is sectional drawing of the heat generating body of FIG.

3 is an equivalent circuit diagram of the heating element of FIG.

4 is a circuit diagram of a constant power supply of an electric field plate or an electric yaw according to the present invention.

* Explanation of symbols for main parts of the drawings

1: heating element 10: heating wire

11: coil 12: low bar

13 cylinder 14 electric insulator

15: equivalent capacitor VR: variable resistor for temperature setting

D ₁ -D ₅ : Diode R ₁ R ₂ : Resistance

SSS: Bidirectional Dyrester 20: Bridge Rectifier

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a power supply for an electric field or an electric field, and more particularly to an electric field plate and a constant power supply for an electric field that use two input power sources having different nominal voltages.

A conventional electric field or electric yoke is designed to be used for an input power source having a single nominal voltage. Usually, the rated voltage is 110V. When the nominal voltage of the input power source is 220V, an expensive power transformer is provided. The changeover switch had to be used in accordance with the rated voltage. Therefore, the installation of an expensive power transformer incurs an economic burden, and the power loss in this power transformer cannot be ignored. In addition, it is inconvenient for the user to check whether the changeover switch is switched to the rated voltage of the electric field or the battery. In case of mistake, when the switch is incorrectly switched to the power of the electric field, etc. Current fuses and temperature fuses of the electric blanket are melted, or there is a problem that the electric supply device and the electric blanket of the electric blanket are burned out.

On the other hand, in the conventional power supply apparatus such as an electric blanket, one end of the inner heating wire 10 of the heating element 1 of the electric blanket is connected to one side of the SCR, and the other end of the inner heating wire is connected to a power source, respectively. At the same time, one end of the heating element outer coil 11 is connected to the gate of the SCR, and the other end thereof is connected to the other end of the SCR through the variable resistor VR, and then connected to the power supply side. In addition, as shown in FIGS. 2A and 2C, the heating element 1 is a cylindrical body 13 formed of a dielectric of nylon # 12 wound around a heating wire 10 on a support rod 12. ), The coil 11 is wound up, and is then covered with an electrical insulator 14 such as PVC. The nylon # 12 has an equivalent capacitor 15 to be described later as the dielectric constant is changed when the temperature is changed. Is the material whose capacity value is changed.

In addition, the equivalent circuit of the heating element 1 shown in FIGS. 2A and 2B has a resistance 16 and a reactance 17 by the inner heating line 10, as shown in FIG. And an equivalent capacitor 15 made of a dielectric, which is a cylindrical body 13, between the reactance 11 'by the outer coil 11, these heating wires 10 and the coil 11.

In the conventional power supply device configured as described above, the temperature setting variable resistor VR is adjusted during the half cycle of the input power when the switch SW is turned on after adjusting the temperature setting variable resistor VR according to the set temperature of the electric sheet. The equivalent capacitor 15 is charged to generate a voltage, and when the voltage becomes higher than the trigger voltage of the SCR, the SCR is triggered to supply power to the heating line 11. After that, when the temperature of the electric field plate is higher than the set temperature due to a voltage fluctuation of the input power, the capacity of the equivalent capacitor 15 by the cylindrical body 11 formed of nylon # 12 is increased, thereby increasing the capacity of the capacitor 15. The charging voltage generated by the charging becomes longer until the trigger voltage of the SCR becomes longer and the trigger time of the SCR becomes correspondingly slower, thereby reducing the power supplied to the heating wire 1. When the temperature is less than or equal to the set value, the capacity of the equivalent capacitor 15 is reduced, the opposite phenomenon occurs as described above, the power supplied to the heating line (1) increases.

As described above, the power supply device may supply power to maintain the temperature of the electric field at all times by automatically adjusting power supplied to the electric field according to the increase and decrease of the electric field temperature with respect to the set temperature. However, in the conventional example, when a power source of one nominal voltage is used (for example, 110V), it is a structure that detects a temperature change of an electric field caused by a slight voltage fluctuation near this nominal voltage and supplies a constant power. Therefore, when the nominal voltage is changed (e.g., 110V to 220V) in a power system having two different nominal voltages (e.g., 110C and 220V), the elution change of the equivalent capacitor 15 is such. Since there is not enough to accommodate a change in the nominal voltage, there was a problem that an electric field or the like cannot be used without using a separate power transformer as described above.

Accordingly, the present invention has been invented in view of the above-described problems of the prior art, and even if the nominal voltage of the input power is changed, the electric sheet or electric yoke is supplied so that the input power is always kept constant automatically without a separate power transformer. It is to provide a constant power supply.

In order to achieve the above object, the electrostatic field supply device of the electric field plate or the electric yoke according to the present invention is connected to a switching element of the SCR, a heating element having an equivalent capacitor whose capacity is increased and decreased with temperature change, and a variable resistor for temperature setting. A parallel circuit and a relay formed of two or more resistors having different resistance values are provided so as to select and connect one resistor of the parallel circuit by the relay so that a constant power is applied to an electric field or an electric field regardless of the height of the nominal voltage. In a power supply for supplying, the rectifier and the bidirectional thyristor (SSS) are connected in series on the input power supply side, and the relay is connected to the output shaft of the rectifier to turn on the bidirectional dylister (SSS) according to the height of the nominal voltage. It is characterized in that the drive of the relay is automatically controlled by turning off.

Hereinafter, with reference to the accompanying drawings showing an embodiment of the present invention will be described in detail.

As shown in FIG. 4, the electrostatic power supply apparatus for an electric field plate according to the present invention has one end of the inner heating line 1 of the electric field plate 1 at one side (cathode) of the SCR, and the other end of the inner heating line. To the power supply and at the same time, one end of the outer coil 11 of the heating element is connected to the gate of the SCR, and the other end is connected to the two power sources connected to the other end (anode) of the SCR through the temperature setting variable resistor (VR). The resistors R ₁ and R ₂ (resistance R ₁ is smaller than resistor R ₂ ) having different resistances are connected in parallel to _one end of the inner heating line 10 of the heating element 1 in parallel. However, after connecting one resistor (R ₁ ) to the normally closed contact terminal (K ₁ ) of the relay (R _y ) and the other resistor (R ₂ ) to the contact terminal (K ₂ ) of the relay (R _y ) also those to be connected again to the variable resistor (VR) and at the same time the input power source side, the rectifier bridge 20 to the four diodes (D ₁ -D ₄₎ and the capacitor (C ₂₎ Bi-die connected to the thyristor (SSS) and the output terminal of the rectifier bridge (20) is configured such that the relay (R _y) connection.

Reference numeral D _5, D ₄ are each diode and a resistor, F ₁ is the heat generation in the fuse (F ₁₎ of the resistor (R ₄₎ As the SCR short circuit is eungdan a temperature fuse conventional protection circuit to cut off the power, and , F ₂ is a current fuse blown by overcurrent, C ₁ is a noise canceling capacitor, R ' ₀ and C is a resistor and a capacitor.

The operation of the present invention configured as described above will be described.

First, when the nominal voltage of the input power supply is low, that is, 110V, the bidirectional thyristor SSS is turned off because of the low voltage. Therefore, since the current does not flow in the bridge rectifier 20, the relay R _y is not operated, and only the resistor R ₁ connected to the phase-closing contact terminal K ₁ of the relay R _y is the variable resistor VR. ) And the inner heating line 10 of the heating element 1. As a result, the equivalent capacitor 15 such as the heating element 1 is charged through the temperature setting variable resistor VR and the resistor R ₁ during the half cycle of the input power, and the equivalent capacitor 15 is charged by this charging. The time at which the voltage reaches the trigger voltage of the SCR is determined, but since the resistance R ₁ is set smaller than the resistance R ₂ , the time at which the trigger voltage is reached becomes faster and the SCR triggers in a shorter time. do.

On the other hand, when a high nominal voltage (for example, 220V) is input, the bidirectional thyristors (SSS) are conducted so that a current flows in the bridge rectifier 20, so that the relay (R _y ) is operated so that the relay (R) _y wherein the contact terminal (large resistance in the resistance value that is connected to the K ₂₎ of a) (R ₂₎ is so connected to the heating element (1) voltage by the charging of the equivalent capacitor 15 has a large resistance (R ₂ This results in a longer time to reach the trigger voltage of the SCR, which slows down the SCR trigger time.

Therefore, if the resistance values of the resistors R ₁ and R ₂ are properly selected, the electric field plate is controlled so that a constant power is always supplied regardless of the change in the nominal voltage of the input power source.

In the embodiment of the present invention, the parallel circuit composed of two resistors is configured to be connected between the variable resistor and the heating element. However, the position of the variable resistor and the parallel circuit for temperature setting may be changed and connected. It can also be configured as a switch device by a semiconductor device of the two, the two nominal voltage is not necessarily limited to 110V and 220V, in the case of a power system having three or more nominal voltage switching device according to this nominal voltage At the same time, the resistances of the parallel circuits selected and connected to the switching device can be provided and used corresponding to the number of the nominal voltages.

As described above, even if the nominal voltage of the input power is changed, the constant power supply device of the electric blanket or the electric yoke according to the present invention is automatically controlled so that the power input to the heating element of the electric blanket is always maintained at a set temperature. As it is supplied, it is not necessary to install a separate expensive power transformer in a power system having two or more different nominal voltages, and the user does not need to check whether the changeover switch is properly switched, and also the power fuse may be disconnected due to incorrect connection of the power supply. There is an effect that it is possible to prevent the failure of the power control device or burnout of the electric field itself.

Claims (1)

The relay is provided with a parallel circuit and a relay formed by connecting a heating element having an equivalent capacitor and a variable resistor for temperature setting to a switching element of the SCR and a variable resistor for temperature setting, and having two or more resistors having different resistance values. In the power supply for supplying a constant power to the electric field or the electric yaw irrespective of the height of the nominal voltage by selecting and connecting one resistor of the parallel circuit, the rectifier 20 and the bidirectional thyristors (SSS) on the input power side ) a series to the connection, and at the same time the relay (R _y) to be connected to the output side of the rectifier 20 turns on the bi-directional thyristor (SSS) depending on high or low of the nominal voltage, the turn-off to automatically to the relay (R _y The electric power supply of the electric field or the electric yaw, characterized in that to control the driving.

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